I have a mod.70 that has a safety problem. When the safety is on in either position (on with bolt locked or on with bolt operable) If you touch the trigger you feel it move slightly. If you release the safety the gun goes off. In the position where you can open the bolt, if you open it and close it the gun goes off . It's a mid 80s vintage. 30-06 .A friend changed the firing pin but it didn't correct it. The trigger assembly looks good no sign of wear. Any help would be appreciated.